<template>
    <div class="login_container">
        <div class="login_box">
            <!-- 头像 -->
            <div class="avatar_box">
                <img src="../assets/logo.png" alt="">
            </div>
            <!-- 登录表单 -->
            <el-form ref="loginFormRef" :model="loginForm" :rules="loginFormRules" label-width="0px" class="login_form">
                <!-- 用户名 -->
                <el-form-item prop="username">
                    <el-input v-model="loginForm.username" prefix-icon="el-icon-user"></el-input>
                </el-form-item>
                <!-- 密码 -->
                <el-form-item prop="password">
                    <el-input v-model="loginForm.password" prefix-icon="el-icon-lock" type="password"></el-input>
                </el-form-item>
                <!-- 按钮 -->
                <el-form-item class="btns">
                     <el-button type="primary" @click="login">登录</el-button>
                     <el-button type="info" @click="resetLoginForm">重置</el-button>
                </el-form-item>
            </el-form>
        </div>
    </div>
</template>

<script>
export default {
    data() {
        return {
            loginForm: {
                username: 'admin',
                password: '123456'
            },
            //表单的验证规则
            loginFormRules: {
                //验证合法性
                username: [
                    { required: true, message: '请输入登录名称', trigger: 'blur' },
                    { min: 3, max: 10, message: '长度在 3 到 10 个字符', trigger: 'blur' }
                ],
                password: [
                     { required: true, message: '请输入密码', trigger: 'blur' },
                     { min: 6, max: 15, message: '长度在 3 到 15 个字符', trigger: 'blur' }
                ]
            }
        }
    },
    methods: {
        //点击重置按钮, 重置登录表单
        resetLoginForm() {
            //console.log(this);
            this.$refs.loginFormRef.resetFields();
        },
        login() {
            this.$refs.loginFormRef.validate(async valid =>{
                if(!valid) return;

                const {data: res} =await this.$http.post('login',this.loginForm);

                console.log(res);
                if(res.meta.status!==200) return this.message.error('登录失败,请检查后重试!');
                //console.log('登录成功');
                this.$message.success("登录成功!");
                //1、 保存登录成功后的token，=>sessionStorage中
                // 1a 除了登录之外的api接口，必须在登录之后才能访问
                // 1b token只在当前网站打开期间生效，所以token保存在=>sessionStorage中
                console.log(res.data.token);
                window.sessionStorage.setItem('token' ,res.data.token);
                //2.  通过编程式的导航跳转到后台主页，路由地址是/home
                this.$router.push('/home');
            });
        }
    }
};
</script>

<style lang="less" scoped>
.login_container{
    background-color: #2b4b6b;
    height: 100%;
}
.login_box{
    width: 450px;
    height: 300px;
    background-color: #fff;
    border-radius: 3px;
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);

    .avatar_box{
        height: 70px;
        width: 70px;
        border: 1px solid #eee;
        border-radius: 50%;
        box-shadow: 0 0 10px rgb(206, 182, 182);
        position: absolute;
        left: 35%;
        top: -20%;
        transform: translate(0, -45%);
        img{
            width: 100%;
            height: 100%;
            border-radius: 50%;
            background-color: #eee;
        }
    }
}

.login_form{
    position: absolute;
    bottom: 0;
    width: 100%;
    padding: 0 20Px;
    box-sizing: border-box;
}

.btns{
    display: flex;
    justify-content: flex-end;
}
</style>
